NSG may refer to:
Businesses Nippon Sheet Glass, a Japanese glass manufacturer NetWare Systems Group, Novell's defunct operating system division
Government and military National Security Guard, a federal counterterrorism force in India National Street Gazetteer, a database of all streets in England and Wales Naturschutzgebiet, a nature protection category in Germany Nebraska State Guard, active during World War II and the Vietnam War Nordic Support Group, a multinational peacekeeping force Nuclear Suppliers Group, an international export regulation body
Places Northampton School for Girls, a high school in Northampton, England New Southgate railway station, London (by station code)
Other uses NSG (group), a British music collective NSG mouse, an immunodeficient laboratory mouse strain North Sea Gas, natural gas from Europe's North Sea oil field